/Engine/Source/Runtime/CoreUObject/Public/Serialization/ArchiveStackTrace.h
Generates a map of all differences between this archive and the given bytes from disk or FPackageData.
bool GenerateDiffMap ( const TCHAR * InFilename, int64 TotalHeaderSize, int32 MaxDiffsToFind, [FArchiveDiffMap](API\Runtime\CoreUObject\Serialization\FArchiveDiffMap) & OutDiffMap )